Analytical Method for Radium ( Exp 226 Ra) in Environmental Samples by the Use of Liquid Scintillation Counting

摘要

A method is described for the determination of exp 226 Ra in environmental samples utilizing a liquid scintillation counting technique. The procedure involves the isolation of exp 226 Ra from the sample matrix and the extraction of exp 222 Rn into a toluene-based scintillant mixture after a suitable ingrowth period. Results of exp 226 Ra analysis of water samples indicate that the method is applicable to samples having a wide variation in exp 226 Ra concentrations and chemical composition. The detection limit was estimated to be less than 0.005Bq (0.15 pCi) depending upon the counting system used and counting time. (Atomindex citation 13:663725)